From abnormal vibration of asynchronous motor and how to determine the cause of the problem in his voice?

AC induction cooling fan motor
Specifications
1.Customised
2. good quality

3. 20 years manufacturing experience

Asynchronous motor produce abnormal vibration and abnormal sound mainly has two aspects of mechanical and electromagnetic. Mechanical reasons: (1), motor blades damage or tighten screw loose blades, blades and the blades into cover, clattering sound produced by it with the weight of the sound, the big small; (2), due to the improper bearing wear or shaft, motor rotor eccentricity caused serious when will make, rotor rub, make the motor produces severe vibration and electric fan motor uneven scratches. (3), motor due to long-term use of the anchor bolt is loose or not foundation, thus the electromagnetic torque of the motor under the action of abnormal vibration; (4), long-term use of the electric motor 12v 500w motor due to a lack of lubricating oil in the bearing inner formed in mill run or bearing steel ball is damaged, therefore make the hiss of the motor bearing interior an exception or purr. Electromagnetic reasons: (1), the normal operation of the motor suddenly appear abnormal sound, in the load running speed decreases significantly, while a low along the roar, may be unbalanced three phase current, the heavy load or single phase operation; (2), the normal operation of the motor, if the stator and rotor winding short-circuit fault ac induction motor 110kw or squirrel cage rotor broken bar when electric are high when low buzz. 

Y series totally enclosed protect Asynchronous motor
Specifications
1. 20 years manufacturing experience
2. 12 months guarantee
3. low noise and temperature rise

4. high starting torque

The fuselage vibration. (1), due to long-term lack of oil running of motor bearing, friction losses increase bearing overheating. In addition, when the motor running, the oil too much or too thick will also cause bearing overheating; (2), when the replacement of lubrication, due to the lubricating oil mixed with hard grain impurity or bearing cleaning uneven net, make bearing wear and overheating, even may damage the bearing; (3), due to improper assembly, fixed end cover wholesalemotor.blogspot.com screw tightness is differ, in a straight line between the two bearing center is unbalanced or bearing outer ring. The bearing rotation is not flexible, adds load after growing friction and heat; (4), belt too tight or motor and were not in a straight line with mechanical shaft center, and thus can increase the bearing load and heat; (5), bearing improper selection or poor quality, such as bearing internal and external ring rust, individual steel ball is not round, etc.; 6, in the operation of the motor bearing damaged, resulting in bearing overheating.